Citation
C. Leroux et al., A homologous series Pb2n+lNb2n-1O7n-1 studied by electron microscopy, EPJ-APPL PH, 7(1), 1999, pp. 33-40
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS
ISSN journal
12860042
→ ACNP
Volume
7
Issue
1
Year of publication
1999
Pages
33 - 40
Database
ISI
SICI code
1286-0042(199907)7:1<33:AHSPSB>2.0.ZU;2-1
Abstract
The PbO-Nb2O5 phase diagram has been investigated, using electron diffracti
on and high resolution electron microscopy (HREM), for [Pb]/[Nb] ratios bet
ween 1 and 1.25. Apart from the basic pyrochlore structure, different long
period superstructures, forming a homologous series Pb2n+1Nb2n-1O7n-1 based
on the pyrochlore structure have been found. Members with n = 5, 7, 9, 11
have been observed and their structure determined based on electron diffrac
tion and HREM. Image simulations allow studying the influence of cation and
oxygen vacancies in the basic structure. Ordering of oxygen vacancies coul
d be detected while no cation vacancies are observed. Deviations from the p
erfect structure and ordered stacking defects are discussed.